Chicago Cubs shortstop Starlin Castro stops a grounder hit by Arizona Diamondbacks' Chris Owings (16), during the fifth inning of a baseball game in Chicago, Tuesday, April 22, 2014. (AP Photo/Paul Beaty)
Chicago Cubs' Anthony Rizzo (44) is congratulated by teammate Starlin Castro, right, after Rizzo's two-run home run against the St. Louis Cardinals in the first inning of a baseball game, Sunday, April 13, 2014, in St. Louis. (AP Photo/Bill Boyce)
Chicago Cubs shortstop Starlin Castro loses the ball as Pittsburgh Pirates Starling Marte steals second during the eighth inning of the MLB National League baseball game on Tuesday, April 8, 2014, in Chicago. (AP Photo/Andrew A. Nelles)
Chicago Cubs shortstop Starlin Castro (13) bunts during spring training baseball practice, Friday, Feb. 21, 2014, in Mesa, Ariz. (AP Photo/Rick Scuteri)
Chicago Cubs shortstop Starlin Castro, right, leads work outs during spring training baseball practice, Wednesday, Feb. 19, 2014, in Mesa, Ariz. (AP Photo/Rick Scuteri)
Chicago Cubs shortstop Starlin Castro (13) leads work outs during spring training baseball practice, Wednesday, Feb. 19, 2014, in Mesa, Ariz. (AP Photo/Rick Scuteri)
Chicago Cubs shortstop Starlin Castro (13) fields ground balls during spring training baseball practice, Wednesday, Feb. 19, 2014, in Mesa, Ariz. (AP Photo/Rick Scuteri)
Chicago Cubs shortstop Starlin Castro (13) runs the bases during spring training baseball practice, Friday, Feb. 21, 2014, in Mesa, Ariz. (AP Photo/Rick Scuteri)